Housing in this service area was mostly built between 1938 and 1991, with the typical house dating to around 1965, and most of it was built out through the 1960s and 70s across the thirty-some named communities we cover. A lot of those original garage doors are still running the rollers they shipped with - open steel bearings that were standard for the era and were never meant to run sixty years without a swap. Across the 188,906 households in this area, 101,657 are owner-occupied houses, and a large share of them are sitting on roller hardware that's original or close to it.
The climate does the rest of the damage. This area sits in a severe cold climate band, and repeated hard freezes stiffen old grease and shrink steel just enough that a roller riding at the edge of worn starts grinding, cracking, or seizing. It's not a dramatic failure - it's accumulated decades of exactly the kind of cold-and-heat cycling that this region gets every year, wearing down hardware that was already due for replacement. That's why roller calls cluster in houses of a certain age here rather than showing up at random.